On Wednesday, an F35 fighter from Britain’s largest aircraft carrier fell into the Mediterranean Sea, but the pilot bailed and was safely restored to the ship.

At around 1000 GMT, the pilot ejected during a routine mission over international waters. There were no other vessels or planes engaged. The cause of the occurrence was not immediately obvious.

“A British F35 pilot from HMS Queen Elizabeth ejected this morning during routine flight operations in the Mediterranean,” a defense ministry official said.

“The pilot has been safely returned to the ship and an investigation has begun, so it would be inappropriate to comment further at this time.”

HMS Queen Elizabeth is the largest and most powerful vessel ever constructed for the British navy. It can carry up to 40 aircraft, including F35Bs.

The United Kingdom has 24 F35Bs in total.